[Ultrasound findings in rupture of the colon after blunt abdominal trauma].

A 20-year old man presented with pain in the upper abdomen but without external signs of injury after blunt abdominal trauma. On sonography free fluid and a mixed echogenic mass in the upper right abdominal quadrant were observed. On laparotomy a hematoma in the ascending colon following rupture of the serosa and muscularis and a hemoperitoneum were discovered.